ircd-ratbox is the primary ircd used on
EFNet, combining the stability of an ircd required
for a large production network together with a rich set of features making it suitable
for use on smaller networks.

ircd-ratbox also has a twin services
package with compatibility code in ircd-ratbox allowing for enhanced features and
better support for networks with channel registration.

The stable version is the latest released version, which
we recommend for use on production networks. This should be suitable
for all server admins.